Piston



Jan. 8, 1924 1,479,816

0. E. JORGENSEN PISTON Filed April 19 1920 I I L 2 Patented Jan. 8, 1924;

UNITED STATES OLAV EsKIi. JORGENSEN, or NEW YORK, N. Y.

PISTON.

Application filed April 19, 1920. Serial No. 374,901.

To all whom it may concern:

Be it known that I, OLAV ESKIL J ORGEN- SEN, a subject of the Kingdom of Denmark, residing at New York, county of New York, and State of New York, have invented certain new and useful Improvements in Pistons, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to pistons, and more particularly to liquid-cooled pistons for internal combustion engines.

It is the object of the invention to provide an improved liquid-cooled piston and particularly one of such strength and construction that the working face is not liable of the working face.

to fracture.

With this general object in view the invention consists in the combinations, details of construction and arrangement of parts which will first be described in connection with the accompanying drawing and then more particularly pointed out.

In the drawing: a

Fig. 1 is a sectional View of a piston constructed in accordance with the invention;

and

Fig. .--2 is a cross-sectional view taken on the broken line 2-2 of Fig. 1.

Referring to the drawing, the piston includes a working face and a cylindrical body portion supported therefrom. In structures embodying the invention to the best advantage, the working face is partly spherical and partly flat. In the embodiment illustrated, the central part 11 of the working face is a portion of a sphere and surrounding this spherical part is an annular flat portion 12. Supported from the working face, and preferably formed integral therewith, is a cylindrical body portion 13 having the usual piston rings 14.

The invention includes means for rigidly supporting the working face from the piston rod. This may be accomplished, for example, by providing the piston rod with a head to which is secured an annular rib carried by the working face. While the construction and arrangement of this rib may vary, in pistons having a working face spherical in part, the rib is advantageously located to coincide substantially with the resultants of the forces acting against the working face. Although capable of various constructions, in that illustrated, the piston rod 15 has a broad head 16 the outer face of which is rabbeted, as appears in Fig. 1, to form an annular shoulder 17. Fitting into this shoulder is the edge of an annular rib 18 carried by the working face of the piston, and preferably formed integral therewith.

With a working face such as that'shown, having a central spherical portion and an outer flat portion, the resultant of the forces acting against the working face at any given radius may be represented by a line that intersects the angle between a tangent to the spherical portion and a right line through the fiat portion. resultants form a cone, the form of which depends on the dimensions and arrangement The rib 18 is formed as the frustrumof a cone that substantially coincides with the imaginary cone mentioned. The rib 18 is secured to the head of the piston rod by bolts 19 or other suitable means, thus rigidly supporting the working face from the piston rod.

The piston rod head and the cylindrical portion 13 are movably fitted together to com lete an enclosed chamber for the cooling iq uid. To this end, in the particular embodlment illustrated as an example, the cylindrical portion 13 of the piston has an internal flange 20 which engages the edge of the piston rod head 16. The latter is provided with a circumferential groove in which is inserted a resilient packing ring 21. This connection between the piston rod head and the piston body completes an enclosed chamber 22 for the cooling liquid and at the same time provides a joint that is not rigid and permits slight play of the parts in case of unequal expansion and contraction.

With the construction described, it will be seen that the cylindrical body portion is supported from the working face.

The invention includes means for introducing a cooling liquid, such as water or oil, into the piston chamber. Although capable of various constructions, in the present embodiment, the flange 20, at some suitable point is provided with a channel 23 communicating with an inlet pipe 24. This pipe is shown as screwed into the flange 20 but it may be connected, and the joint packed, in any suitable manner. To carry away the cooling liquid, there is provided an internal pipe 25 communicating with an outlet pipe 26 carried by flange 20 in any Consequently, the several into the interior of the piston, as appears in Fig. 1. As here shown inlet and outlet pipes are close together but they may be widely separated if desired. To permit circulation of the cooling liquid, the rib 18 is provided with a number of slots or openings 27.

It will be understood that the invention is not limited to the specific construction or arrangement of parts shown, but modifications may be made therein, while retaining the invention defined by the claims.

lVhat I claim is:

1. A liquid-cooled piston having a work ing face, a headed piston rod, a rib integral with the working face, means for securing said rib to the head of the piston rod, a cylindrical body portion supported fromthe working face, the cylindrical body portion and the head of the piston rod being movably fitted together to complete an enclosed chamber for the cooling liquid, and means for conducting cooling liquid into such chamber.

2. A liquid-cooled piston having a working face partly spherical and partly fiat, a headed piston rod, a cylindrical body portion supported from the working face, the cylindrical body portion and the head of the piston rod being movably fitted together to complete an enclosed chamber for the cooling liquid, an annular rib for rigidly supporting the working face from the piston rod, located to coincide substantially with the resultants of the forces acting against the working face, and means for conducting cooling liquid into said chamber.

3. A piston having a working face partly spherical and partly flat, a headed piston rod, a cylindrical body portion integral with the working face and supported therefrom, the cylindrical body portion and the head of the piston rod being movably fitted together to complete an enclosed chamber for the cooling liquid, an annular rib integral with the working face, secured to the "lead of the piston rod, and located to coincide substantially with the resultants of the forces acting against the mrking face, and means for conducting cooling liquid into said chamber.

4. A piston having a working face partly spherical and partly flat, a headed piston rod, a cylindrical body portion integral with the Working face and supported therefrom, means for completin an enclosed chamber for the cooling liqui an annular perforated rib integral with the working face, secured to the head of the pistonrod, and located to coincide substantially with the resultants of the forces acting against the working face, and means for conducting cooling liquid into said chamber.

5. A piston having a working face partly spherical and partly flat, a headed piston rod, a cylindrical body portion supported from the working face, means for completing an enclosed chamber for the cooling liquid, 21 single annular rib for rigidly sup porting the working face from the piston rod, located to coincide substantially with the resultants of the forces acting against the working face, and means for conducting cooling liquid into said chamber.

6. A piston having a working face partly spherical and'partly flat, a headed piston rod, a cylindrical body portion integral with the working face and supported therefrom, and an annular rib integral with the working face, secured to the head of the piston rod, and located to .coincide substantially with the resultants of the forces acting against the working face.

7. A liquid-cooled piston having a working face, a headed piston rod, a frustroconical perforate rib integral with the Working face and rigidly supported. from the piston rod head, a cylindrical body por tion supported from the working face, the cylindrical body portion and the piston head being movably fitted together to complete an enclosed chamber for the cooling liquid, and means for conducting cooling liquid into said chamber.

In testimony whereof, I have hereunto set my hand.

OLAV ESKIL J ORGENSEN 

